Safety Caliper Interlocking Device for Elevator Overload

Abstract

The present invention discloses a safety caliper linkage device for an elevator during overload, which includes a base, a floating bottom plate, a spring, a lateral movement guide block, a lock slider, a synchronous slider, a worm gear drive mechanism, and a safety caliper. The base is fixed to the bottom of the elevator car. The floating bottom plate is connected to the elevator car via a spring. The lateral movement guide block is fixed to the floating bottom plate. The lock slider slidably engages with the lateral movement guide block in the lateral direction and moves up and down. The synchronous slider slidably engages with the lock slider in the vertical direction and moves in the lateral direction. The synchronous slider is moved laterally by the elevator car door. The base is provided with a vertical chute and a lateral movement chute. When the elevator car door is fully opened, the lock slider is in the vertical chute, and the bottom end of the vertical chute is lower than the bottom surface of the lateral movement chute. When the elevator car is overloaded, at least a part of the lock slider is fitted into the bottom end of the vertical chute and cannot move laterally. The lock slider moves up and down to rotationally drive the worm screw, and the worm wheel drives the safety caliper. The present invention can ensure safety by locking the car using a mechanical structure when the elevator is overloaded.

Description

Technical Field

[0001] The present invention relates to an elevator safety device, and particularly to a safety caliper linkage device for an elevator during overload, belonging to the technical field of elevators.

Background Art

[0002] An elevator is a special device commonly seen in daily life, with a very high usage frequency in daily life, and elevator accidents occur from time to time. To ensure the safe operation of the elevator, it is necessary to monitor the overload of the elevator.

[0003] In the prior art, most of the protection methods for elevator overload adopt an overload alarm device. After passengers enter the elevator, the load situation of the elevator is detected through a sensor. When the load exceeds the rated value, the system determines that the elevator is overloaded and gives an alarm. However, this alarm method does not have a function of locking the car when the elevator is overloaded. For example, in the event of a power outage or other special situations, due to the existence of overload, the elevator car may fall, threatening the safety of passengers.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In view of the above drawbacks of the prior art, the present invention provides a safety caliper linkage device for an elevator during overload, which uses a mechanical structure to lock the elevator when the elevator is overloaded without affecting the normal operation of the elevator.

Means for Solving the Problems

[0005] The technical solution of the present invention is as follows. A safety caliper linkage device for an elevator overload, including a base, a floating bottom plate, a spring, a lateral movement guide block, a lock slider, a synchronous slider, a worm gear drive mechanism, and a safety caliper. The base is fixed to the bottom of the elevator car. The floating bottom plate is provided in the elevator car for carrying passengers and is connected to the elevator car via the spring. The lateral movement guide block is fixedly connected to the floating bottom plate. The lock slider slidably engages with the lateral movement guide block in the lateral direction and moves up and down synchronously. The synchronous slider slidably engages with the lock slider in the longitudinal direction and moves laterally synchronously, and is moved laterally by the elevator car door. The base is provided with a longitudinal chute and a lateral movement chute connected to each other. The lateral movement guide block is provided in the longitudinal chute. The synchronous slider is provided in the lateral movement chute. When the elevator car door is fully opened, the lock slider is in the longitudinal chute, and the bottom end of the longitudinal chute is lower than the bottom surface of the lateral movement chute. When the elevator car is overloaded, at least a part of the lock slider is fitted into the bottom end of the longitudinal chute and cannot move laterally. The safety caliper is provided on the base to clamp the elevator guide rail. The worm gear drive mechanism includes a worm wheel and a worm screw. The lock slider moves up and down to rotationally drive the worm screw, and the worm wheel rotates to drive the clamping or releasing of the safety caliper.

[0006] Furthermore, in order to prevent the unexpected clamping of the safety caliper due to the lowering of the floating bottom plate caused by the acceleration generated during operation, a connection block is fixedly connected to the side direction of the lock slider. The worm gear drive mechanism includes a vertical rotation axis and a horizontal rotation axis. One end of the horizontal rotation axis is machined as the worm screw. The vertical rotation axis and the horizontal rotation axis are in transmission with each other. A first screw is machined on the vertical rotation axis, and a first nut fitted to the first screw is screwed and provided thereon. The first nut is rotatably provided within a first sleeve ring. A horizontally telescopic sleeve is connected to the connection block. The movable end of the horizontally telescopic sleeve is fixed to the first sleeve ring. A lock ring that rotates synchronously with the first nut is provided on the first nut. A plurality of pin holes are provided on the circumferential surface of the lock ring. An insertion pin fitted to the pin holes is provided at the fixed end of the horizontally telescopic sleeve. When the elevator car door opens, the insertion pin is inserted into the pin holes, and when the elevator car door closes, the insertion pin is withdrawn from the pin holes. When the insertion pin is inserted into the pin holes, the rotation of the first nut is blocked.

[0007] Furthermore, when the elevator car door closes, a second screw is machined on the lateral rotation shaft so that the safety caliper can be reset. A second nut that fits onto the second screw is screwed and provided thereon. The second nut is rotatably provided within a second sleeve ring. The connection block is connected to the second sleeve ring via a longitudinally telescoping sleeve. A locking member is fixedly connected to the second nut. The locking member includes two locking rings provided at intervals in the axial direction of the lateral rotation shaft. A locking plate is fitted onto the lateral rotation shaft between the locking rings. Each of the two surfaces of the locking plate can be locked to one of the two locking rings. A guide groove is provided on the base along the axial direction of the lateral rotation shaft. One end of the locking plate is provided within the guide groove, and a magnet is provided at the end of the guide groove. After the elevator car door opens, one end of the locking plate is attracted by the magnet and is located between the two locking rings, releasing the locking by the locking rings.

[0008] Furthermore, when the elevator car door opens, the distance between the locking plate and the locking ring is greater than the depth at which the insertion pin is inserted into the pin hole.

[0009] Furthermore, a plurality of bosses distributed circumferentially are provided on both sides of the locking plate, and concave holes fitted to the bosses are provided on the opposing surfaces of the locking ring.

[0010] Furthermore, two pairs of the safety calipers are provided, and each of the two pairs of safety calipers is provided on both sides of the base.

[0011] Furthermore, the safety caliper includes two friction blocks. A bracket that slidably engages with the base is attached to the friction block. When the bracket slides on the base, the friction blocks approach or separate from each other. A link is hinged to the bracket, and the end of the link is hinged to the worm wheel.

[0012] Furthermore, the synchronous slider and the third screw are combined to form a screw nut motion pair. A first gear is fixedly provided on the third screw, and a second gear meshing with the first gear is provided on the base. The second gear and the fourth screw constitute a screw nut motion pair. The fourth screw is provided in parallel with the third screw, and a lever connected to the elevator car door is provided on the fourth screw. By installing two sets of screws, the synchronous slider is moved in the direction opposite to the elevator car door, leaving an easy moving space for the worm gear drive mechanism and the corresponding laterally telescopic sleeve and vertically telescopic sleeve.

[0013] Furthermore, the lock slider is slidably engaged laterally with the laterally moving guide block through a laterally T-shaped groove, and the synchronous slider is slidably engaged vertically with the lock slider through a vertically T-shaped groove.

[0014] Furthermore, the longitudinal rotating shaft is transmitted to the lateral rotating shaft through a bevel gear, and the first nut and the first sleeve ring and between the second nut and the second sleeve ring are rotationally fitted through bearings.

Advantages of the Invention

[0015] The advantages of the technical solution according to the present invention are as follows. The present invention is attached to the bottom of the elevator car, without changing the conventional elevator safety protection device, adding a safety protection system to the conventional protection device, realizing the safety braking function when the elevator is overloaded, and also realizing the reset of the safety caliper and the safety locking function of the elevator door system when the elevator is overloaded, preventing the elevator door from closing and locking people inside the elevator. Strengthen the overload protection performance before the elevator starts, and improve the safety of the elevator when carrying passengers.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0017] Hereinafter, the present invention will be further described in relation to embodiments. It should be understood that these embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. After reading this description, various equivalent modifications of this description by those skilled in the art are within the scope defined by the claims attached to this application.

[0018] As shown in FIGS. 1 to 3, the safety caliper interlocking device for elevator overload according to this embodiment includes a base 1, a floating bottom plate 2, a spring 3, a lateral movement guide block 4, a lock slider 5, a synchronous slider 6, a worm gear drive mechanism, and a safety caliper 7. The base 1 is fixed to the bottom of the elevator car and provides a mounting base for the safety caliper interlocking device for elevator overload.

[0019] The floating bottom plate 2 is provided inside the elevator car, carries passengers as the floor of the elevator car, and is connected to the elevator car via a spring 3, and the spring 3 is compressed by different distances according to different loading weights. Two springs 3 are schematically shown in the figure, and the specific number of springs 3 can be provided in plural according to requirements.

[0020] In this embodiment, in addition to the base 1, the floating bottom plate 2, and the spring 3, two sets of the lateral movement guide block 4, the lock slider 5, the synchronous slider 6, the worm gear drive mechanism, and the safety caliper 7 are provided. The structure of each set is connected corresponding to one elevator car door, and it is realized to prevent the closing of the elevator car door during overload. Hereinafter, the specific structure will be described with one set of the structures.

[0021] One lateral movement guide block 4 is fixedly connected to the bottom of the floating bottom plate 2 via a straight rod. On the base 1, a vertical chute 101 is provided to limit the lateral movement guide block 4 in the vertical chute 101. This lateral movement guide block 4 moves up and down according to the up and down movement of the floating bottom plate 2. A lateral T-shaped groove is formed on the bottom surface of the lateral movement guide block 4, and a T-shaped strip 501 fitted into the lateral T-shaped groove is provided on the top surface of the lock slider 5. The lock slider 5 slidably fits horizontally on the lateral movement guide block 4 and moves up and down synchronously. That is, when the lateral movement guide block 4 moves up and down, the lock slider 5 is moved up and down in the vertical chute 101, and the lock slider 5 is movable horizontally.

[0022] On one side surface of the lock slider 5 (this side surface is the side surface in the opening and closing direction of the elevator car door, and is defined as the left and right side surfaces in this embodiment), a protruding T-shaped strip 501 similar to the top surface is provided. On the side surface of the synchronous slider 6, a vertical T-shaped groove fitted to this protruding T-shaped strip 501 is provided. In this way, when the lock slider 5 moves horizontally to the left and right, the synchronous slider 6 can be moved (the synchronous slider 6 can move the lock slider 5), and the synchronous slider 6 does not affect the up and down movement of the lock slider 5. On the base 1, a lateral movement chute 102 connected to the vertical chute 101 is provided. The lock slider 5 and the synchronous slider 6 are movable horizontally in the lateral movement chute 102.

[0023] The bottom end of the vertical chute 101 is provided lower than the bottom surface of the horizontal moving chute 102. The elastic force of the spring 3 connected between the floating bottom plate 2 and the elevator car is provided according to the weight that the elevator car can bear. When the motor car is overloaded, the bottom of the lock slider 5 is fitted into the bottom end of the vertical chute 101, and the bottom surface of the lock slider 5 is lower than the bottom surface of the horizontal moving chute 102. Therefore, the lock slider 5 cannot slide on the horizontal moving chute 102. Accordingly, the synchronous slider 6 cannot slide horizontally. Since the synchronous slider 6 moves synchronously with the elevator car door via a set of transmission members, when the synchronous slider 6 cannot move horizontally, the elevator car door cannot move horizontally either. Thus, when overloaded, the purpose of not being able to close the elevator car door is achieved.

[0024] To make the device structure compact and rationally utilize the space of the base 1, the transmission member moves the synchronous slider 6 in the opposite direction to the elevator car door by two sets of screw-nut mechanisms. Specifically, the synchronous slider 6 and the third screw 8 are combined to form a screw-nut motion pair. The third screw 8 is provided horizontally left and right. A first gear 9 is fixedly provided on the third screw 8. The second gear 10 meshing with the first gear 9 is rotatably provided on the base 1. The second gear 10 and the fourth screw 11 constitute a screw-nut motion pair. The fourth screw 11 is provided parallel to the third screw 8. Levers 12 connected to the elevator car door are connected to both ends of the fourth screw 11. The elevator car door may be provided to be engaged between the two levers 12, holes may be provided in the elevator car door, and the head end of the lever 12 is inserted into the hole in the elevator car door to achieve linkage with the elevator car door. In this way, when the elevator car door moves horizontally left and right, the fourth screw 11 is moved horizontally left and right, and further the second gear 10 is rotationally driven. Under the drive of the second gear 10, the first gear 9 rotates the third screw 8, thereby further driving the synchronous slider 6 to move horizontally left and right.

[0025] Another function of the embodiment of the present invention is that when the elevator is overloaded, the excessive descent of the floating bottom plate 2 causes the safety caliper 7 to clamp the elevator guide rail, making the elevator car immovable, thereby avoiding unexpected sliding of the elevator car due to overload and power failure. Specifically, as shown in FIGS. 1 and 4, the safety calipers 7 are provided on both sides of the base 1 to clamp the elevator guide rail. Each side of the safety caliper 7 includes two friction blocks 701. A bracket 702 that is slidably engaged with the base 1 is attached to the friction block 701, and the movement of the bracket 702 causes the friction blocks 701 to approach or separate from each other. When the friction blocks 701 approach each other, they can clamp the elevator guide rail. The bracket 702 is driven by a link 703 connected to the bracket 702, and the two links 703 are respectively connected by two brackets 702 and intersect.

[0026] The worm gear drive mechanism includes a vertical rotating shaft 13 and a horizontal rotating shaft 14. The horizontal rotating shaft 14 is provided horizontally from left to right. The vertical rotating shaft 13 is perpendicular to the horizontal rotating shaft 14. At the ends of the vertical rotating shaft 13 and the horizontal rotating shaft 14, the horizontal rotating shaft 14 and the vertical rotating shaft 13 can be transmitted to each other by a pair of bevel gears 15. The head end of the horizontal rotating shaft 14 is machined as a worm screw 16, and both sides of the worm screw 16 are engaged with two worm wheels 17 in a horizontal state. The other end of the link 703 connected to the bracket 702 of the safety caliper 7 described above is hinged at a position close to the outer circumference of the worm wheel 17. In this way, when the horizontal rotating shaft 14 rotates, the two worm wheels 17 are driven to rotate in opposite directions, thereby pulling the link 703, causing the friction blocks 701 to approach or separate from each other, and further clamping or releasing the safety caliper 7.

[0027] As shown in FIGS. 5 and 6, a connection block 19 is fixedly connected to the rear side of the lock slider 5 via a cross bar 18. A first screw 1301 is machined on the vertical rotation shaft 13, and a first nut 20 fitted to the first screw 1301 is screwed thereon. The first nut 20 is provided in a first sleeve ring 21 via a bearing, and the two are rotationally fitted to each other. A laterally telescopic sleeve 22 is connected to the connection block 19, and the movable end of the laterally telescopic sleeve 22 is fixed to the first sleeve ring 21. A lock ring 23 that rotates synchronously with the first nut 20 is provided on the first nut 20, and a plurality of pin holes 2301 are provided on the circumferential surface of the lock ring 23. An insertion pin 24 fitted to the pin holes 2301 is provided at the fixed end of the laterally telescopic sleeve 22. In this way, when the lock slider 5 moves horizontally, the connection block 19 moves horizontally synchronously, and the insertion pin 24 is inserted into the pin holes 2301 of the lock ring 23 to prevent the rotation of the first nut 20. In this case, the lock slider 5 moves up and down to move the connection block 19 up and down, and further moves the first nut 20 up and down. Since the first nut 20 is locked by the insertion pin 24 and cannot rotate, the first screw 1301 (vertical rotation shaft 13) rotates, thereby rotationally driving the horizontal rotation shaft 14, and the safety caliper 7 operates. However, when the elevator car door is fully opened, the insertion pin 24 is inserted into the pin holes 2301, and when the elevator car door starts to close, the insertion pin 24 is withdrawn from the pin holes 2301. In this way, after the elevator car door is closed, the insertion pin 24 is in a withdrawn state, the first nut 20 can rotate freely, and the floating bottom plate 2 drives the first nut 20 to move up and down by moving up and down. At the same time, since the first nut 20 rotates, the first screw 1301 cannot be rotated, and further the safety caliper 7 does not operate.

[0028] A second screw 1401 is machined on the horizontal rotation shaft 14, and a second nut 25 that fits onto the second screw 1401 is screwed onto the second screw 1401. The second nut 25 is provided inside a second sleeve ring 26 via a bearing, and the two are rotationally fitted together. A vertically telescoping sleeve 27 is connected to the connection block 19, and the movable end of the vertically telescoping sleeve 27 is fixed to the second sleeve ring 26. A locking member is fixedly connected to the second nut 25. This locking member includes two locking rings 28 provided at intervals in the axial direction of the horizontal rotation shaft 14. A locking plate 29 is fitted onto the horizontal rotation shaft 14 between the locking rings 28. A plurality of bosses 2901 distributed in the circumferential direction are provided on both sides of the locking plate 29. Concave holes 2801 that fit onto the bosses 2901 are provided on both opposing surfaces (the surfaces facing the locking plate 29) of the locking rings 28. When the locking plate 29 moves horizontally and comes into close contact with any one of the locking rings 28, the bosses 2901 are inserted into the concave holes 2801, and the locking member cannot rotate, that is, the second nut 25 cannot rotate. A guide groove 103 along the axial direction of the horizontal rotation shaft 14 is provided on the base 1. One end of the locking plate 29 is provided inside the guide groove 103, and a magnet 30 is provided at the end of the guide groove 103. When the elevator car door opens, one end of the locking plate 29 is attracted by the magnet 30 and is located between the two locking rings 28, releasing the locking by the locking rings 28. In this state, the distance between the locking plate 29 and the locking rings 28 is greater than the depth at which the insertion pin 24 is inserted into the pin hole 2301. The operation of rotating the second nut 25, the locking member, and the locking plate 29 horizontally will be described during the following device operation.

[0029] The operation process of the safety caliper interlocking device for overload of the elevator in this embodiment is as follows.

[0030] Describe the elevator car door on one side. When the elevator car door opens, the fourth screw 11 is moved to the left by the lever 12, driving the second gear 10 to rotate, and further driving the third screw 8 to rotate by the first gear 9. With the drive of the third screw 8, the synchronous slider 6 slides the lock slider 5 to the right limit position in the lateral movement chute 102 of the base 1. At this time, the insertion pin 24 connected to the laterally telescopic sleeve 22 is inserted into the pin hole 2301 of the lock ring 23, and the locking member of the second nut 25 presses the locking plate 29 to move towards the end with the magnet 30 in the guide groove 103 of the base 1. At the right limit position, the locking plate 29 is adsorbed by the magnet 30, releasing the locking plate 29 from the left locking ring 28 of the locking member and maintaining a certain distance from the right locking ring 28. This distance is larger than the depth at which the insertion pin 24 is inserted into the pin hole 2301. After a passenger enters the elevator car, the floating bottom plate 2 moves downward, the lateral movement guide block 4 moves the locking slider downward, and further moves the connection block 19 downward. By moving downward, the connection block 19 moves the first nut 20 downward. At this time, due to the locking of the insertion pin 24, the vertical rotation shaft 13 is rotated to further drive the lateral rotation shaft 14 to rotate, and the friction block 701 of the safety caliper 7 gradually approaches. When overloaded, it does not contact (or slightly contacts) the elevator guide rail. After being overloaded, the floating bottom plate 2 moves further downward, so that the bottom of the lock slider 5 is fitted into the bottom end of the vertical chute 101 and cannot move laterally. At this time, the synchronous slider 6 cannot move laterally and acts in the reverse direction on the elevator car door so that it cannot be closed further. Also, by moving further downward, the connection block 19 brings the friction block 701 of the safety caliper 7 closer, thereby clamping the elevator guide rail. In this state, if a power failure occurs, the safety caliper 7 of this device can prevent the unexpected up and down movement of the elevator car as a second safeguard.

[0031] When a passenger gets out of the elevator car, the floating bottom plate 2 moves the lateral movement guide block 4 and the lock slider 5 upward under the action of the spring 3. When in an overweight state, the bottom of the lock slider 5 is higher than the bottom surface of the lateral movement chute 102 of the base 1, and the lock slider 5 can move further laterally. The elevator car door moves to the right and closes. The synchronous slider 6 moves the lock slider 5 to the left by the transmission of the third screw 8 and the fourth screw 11. At the initial stage when the elevator car door moves to the right, the locking member moves to the left, but neither of the two locking rings 28 is locked with the locking plate 29, and the insertion pin 24 is withdrawn from the pin hole 2301. Since the locking member is not locked during this process, the second nut 25 can rotate freely. When the second nut 25 moves to the left, it does not rotationally drive the lateral rotation shaft. After the insertion pin 24 is completely withdrawn from the pin hole 2301, the locking member moves further to the left to lock the right locking ring 28 of the locking member and the locking plate 29. At this time, the second nut 25 cannot rotate due to the locking of the locking member. As the elevator car door moves further to the right and closes, the second nut 25 moves to the left to rotate the lateral rotation shaft 14, and the worm gear drives the friction block 701 of the safety caliper 7 to separate and release the elevator guide rail. During the rotation of the lateral rotation shaft 14, the longitudinal rotation shaft 13 also rotates. Since the insertion pin 24 has already been withdrawn from the pin hole 2301 and the locking ring 23 and the first nut 20 can rotate freely, the rotation of the longitudinal rotation shaft 13 can rotate the first nut 20 without moving it up and down, ensuring that the device does not get stuck. When the elevator reaches the designated floor and the elevator car door opens, the elevator car door moves to the left, and the operating process of each component is opposite to that of the right movement of the elevator car door, which will not be described further. In this way, in this device, the purpose of ensuring safety by mechanical locking during overload is achieved.

Claims

1. An elevator overload safety caliper interlocking device, The elevator comprises a base, a floating bottom plate, a spring, a lateral movement guide block, a lock slider, a synchronous slider, a worm gear drive mechanism and a safety caliper, the base is fixed to the bottom of an elevator car, the floating bottom plate is provided in the elevator car and connected to the elevator car via the spring for carrying passengers, the lateral movement guide block is fixedly connected to the floating bottom plate, the lock slider slides laterally on the lateral movement guide block to move up and down synchronously, the synchronous slider slides vertically on the lock slider to move laterally synchronously and is moved laterally by an elevator car door, the base is provided with a vertical chute and a lateral movement chute connected to each other, and the lateral movement guide block is provided on the vertical chute. the synchronization slider is provided on the lateral movement chute, when the elevator car door is fully open, the lock slider is on the vertical chute, a bottom end of the vertical chute is lower than a bottom surface of the lateral movement chute, when the elevator car is overloaded, at least a part of the lock slider is fitted into the bottom end of the vertical chute and cannot move laterally, the safety caliper is provided on the base for clamping an elevator guide rail, the worm gear drive mechanism includes a worm wheel and a worm screw, the lock slider moves up and down to rotate and drive the worm screw, and the worm wheel rotates to drive the clamping or release of the safety caliper.

2. A connection block is fixedly connected to the side of the lock slider, the worm gear drive mechanism includes a vertical rotation shaft and a horizontal rotation shaft, one end of the horizontal rotation shaft is processed as the worm screw, the vertical rotation shaft and the horizontal rotation shaft transmit power to each other, a first thread is processed on the vertical rotation shaft, a first nut is screwed onto the first thread, and the first nut is rotated within a first sleeve ring, a horizontal telescopic sleeve is connected to the connection block, and a movable end of the horizontal telescopic sleeve is connected to the first sleeve ring.

2. The safety caliper interlocking device for use in an elevator overload as claimed in claim 1, characterized in that the first nut is provided with a lock ring fixed to a bling, the first nut is provided with a lock ring that rotates synchronously with the first nut, a plurality of pin holes are provided on the peripheral surface of the lock ring, and an insertion pin that fits into the pin hole is provided at the fixed end of the laterally extensible sleeve, the insertion pin is inserted into the pin hole when the elevator car door is opened, and is extracted from the pin hole when the elevator car door is closed, and when the insertion pin is inserted into the pin hole, it prevents the first nut from rotating.

3. 3. The safety caliper interlocking device for elevator overload according to claim 2, characterized in that: a second thread is machined on the horizontal rotation shaft, a second nut is threadedly engaged with the second thread, the second nut is rotated within a second sleeve ring, the connection block is connected to the second sleeve ring via a vertical telescopic sleeve, and a locking member is fixedly connected to the second nut, the locking member includes two locking rings spaced apart in an axial direction of the horizontal rotation shaft, a locking plate is fitted on the horizontal rotation shaft between the locking rings, each of both sides of the locking plate can be locked to one of the two locking rings, the base is provided with a guide groove along the axial direction of the horizontal rotation shaft, one end of the locking plate is provided in the guide groove, and a magnet is provided at an end of the guide groove, and after the elevator car door is opened, one end of the locking plate is attracted to the magnet and is between the two locking rings, and is released from the locking by the locking ring.

4. 4. The elevator overload safety caliper interlocking device according to claim 3, wherein when the elevator car door is open, a distance between the locking plate and the locking ring is greater than a depth to which the insertion pin is inserted into the pin hole.

5. The safety caliper interlocking device for elevator overload as claimed in claim 3, characterized in that a plurality of bosses are provided on both sides of the locking plate and distributed in a circumferential direction, and recesses are provided on both opposing sides of the locking ring to fit into the bosses.

6. The safety caliper interlocking device for elevator overload as claimed in claim 1, characterized in that the safety caliper is provided in two pairs, each of the two pairs of safety calipers being provided on both sides of the base.

7. The safety caliper interlocking device for elevator overload as claimed in claim 1, characterized in that the safety caliper includes two friction blocks, a bracket that is attached to the base and slides on the base, and when the bracket slides on the base, the friction blocks move closer to or farther from each other, a link is hinged to the bracket, and an end of the link is hinged to the worm wheel.

8. 4. The safety caliper interlocking device for elevator overload as claimed in claim 2 or 3, characterized in that the synchronous slider and a third screw are combined to form a screw-nut motion pair, a first gear is fixedly provided on the third screw, a second gear meshing with the first gear is provided on the base, the second gear and a fourth screw constitute a screw-nut motion pair, the fourth screw is provided in parallel with the third screw, and a lever connected to an elevator car door is provided on the fourth screw.

9. 2. The safety caliper interlocking device for elevator overload as claimed in claim 1, wherein the lock slider is laterally slidably fitted to the lateral movement guide block via a lateral T-shaped groove, and the synchronous slider is vertically slidably fitted to the lock slider via a vertical T-shaped groove.

10. 4. The safety caliper interlocking device for use in an elevator overload according to claim 3, wherein the vertical rotation shaft is transmitted to the horizontal rotation shaft via a bevel gear, and the first nut and the first sleeve ring, and the second nut and the second sleeve ring are rotationally fitted together via bearings.

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